* [[iptables]] - A powerful [[firewall]] built into the linux kernel that is part of the [http://en.wikipedia.org/wiki/Netfilter netfilter] project

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* {{App|[[Iptables]]|A powerful [[firewall]] built into the linux kernel that is part of the [http://en.wikipedia.org/wiki/Netfilter netfilter] project|http://www.netfilter.org/projects/iptables/index.html|{{Pkg|iptables}}}}

* {{App|[[Wikipedia:tcpdump|Tcpdump]]|A common console-based packet analyzer that allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network.|http://www.tcpdump.org/|{{Pkg|tcpdump}}}}